Process for making dry cells.



No. 869,446. PATENTBD OCT. 29, 1907. P. L. MEYER.

PROCESS FOR MAKING DRY CELLS APPLICATION FILED rm.19,190e.

11g 1. 2. ZZy? 5.

.l this seal or plug 4 sets down in the receptacle so that the lining when formed will not reach quite to the top of the cell, as shdwn in Fig. 2, the purpose oi this being to provide a place above the lining for the tar or pitch by which the cell is llnally sealed up.

The plastic composition having been placed in the zinc receptacle and the latter scaled up with the temporary seal, the receptacle is then rapidly rotated on its axis to subject the composition to the action of centrifugal force. the effect of this force being to spread or distribute the lining over the inner surface of the re ceptacle. Any suitable means may be employed for rotating the receptacle, but the means shown in Fig. 4 are preferably employed, as by this means a large number of the receptacles may be rotated simultaneously. As shown these means comprise a pair of suitably supported standards 5, in which are journalcd a pair of rolls 6, 7, the roll 6 being shown as the driving roll. Resting on these rolls, 6, 7, as shown in Fig. 6, so as to be rotated lrictionally thereby, is a hollow tube 8, in which tube the receptacles l are placed on their sides, the ends of the tube 8 being closed and the receptacles being held therein by a plug or plugs 9.

The driving roll 6, driven from any suitable puree of power, is provided with a gear 10 which meshes with an intermediate gear 11 on a short shalt 12 mounted in standards 5. This intermediate gear ll. meshes in turn with a gear 13 on the roll '7 and drives the latter, the rolls 6, 7, thus having the same speed of rotation. The rotation of the tube 8 is continued until the plaster lining has set or hardened sufficiently to prevent it running or changing its position, which under ordi nary conditions. is from two to three minutes. The receptacles are then removed from the tube and the temporary sealing corks or plugs removed. Each of the receptacles is now in the condition shown in Fig. 2, having a lining 14 of plaster and electrolyte, evenly distributed and of a uniform density over its inner side walls, the bottoms of the receptacle being Without any of the lining, substantially no plaster sticking thereon. The receptacle thus lined is now ready to receive the carbon rod and the depolarizing agent. The carbon rod 15 is placed in the receptacle and the depolaiizer 16 firmly tamped in position around the rod, the carbon being insulated from the zinc by the disl: 2 as be 1 l l l I tore stated. As shown in Fig. 3 the depolarizer extends upward only as high as the lining. Th space above the lining and the depolarizer and below the top of the zinc is then tilled in with a seal of tar, pitch or other resinous substance 17, the whole cell being then incased in a paper shell as is usual in this type of cells.

While the substance employed tor lining the receptacl'e has been defined in the claims as being plaster of paris, it will be understood that other suitable substances ol like character may out the invention.

What I claim is:-

1. The herein described method of constructing a dry cell which consists in first placing in the receptacle eonstituting the negative pole electrode of the cell a charge of a composition of plaster of paris in a suitably fluent condition, rotating the receptacle on its axis till the composition has set to distribute the composition by centrifugal action, positioning the carbon and the depolarizing agent in the receptacle, and then sealing the receptacle up.

2. The herein described method of constructing a dry cell which consists in first placing in the receptacle eonsti= toting the negative poleelectrode of the cell a charge of a composition of plaster of paris in a suitable fluent c0ndi tlon, temporarily closing the receptacle, rotating the recep tacle on its axis till the composition has set to. distribute the composition bycentrifugal action, positioning the carbon and the depolarizing agent in the receptacle, and then sealing the receptacle up. p

3. The herein described method of constructing a dry cell which consists in first placing in the receptacle consti tuting the negative pole electrode of the cell a charge of o, composition of plaster of paris in a suitably fluent condltion, temporarily closing the receptacle, rotating the receptacle on its axis till the composition has set to distribute the composition by centrifugal action, opening the re ceptacle, and'thcn when the lining has sufficiently hardened positioning the carbon element and the depolarizing element in the receptacle, and then sealing the receptacle up.

4. An element for a dry cell battery consisting of a zinc receptacle and a lining of plaster of paris and an'electrolyte, said composition adhering to and being supported solely by the inner wall of the receptacle and being centrllugally deposited thereon.

ln' testlmony whereof, I have hereuntovset my hand, in the presence of two subscribing Witnesses PAUL L. MEYER.

Witnesses P. B. PHILIPP, J. A. GRAVES.

be employed in carrying 

